I always say this when this topic comes up. Visit a place to see specific things. Have a plan what you want to see and why. Don't go because of some romantic idea of Paris being romantic and because you want the "experience".
Access to WW1 battlefields is apparently difficult.
That's good advice, adding this to my previous list
Mont Saint-Michel -> incredible place to visit, been there by night too cool experience
Perros Guirec -> beautiful nature walk on sea red rocks lot of memorable unique landscapes
Saint-Malo -> very characteristic fortified small sea town to visit, unique look
Chenonceau -> nice castle to visit
Chambord ->nice castle to visit
Dinard -> very nice sea small town to visit with big mansions giving unique look, relaxing place to do bit beach
Dinan -> very characteristic medieval small town to visit
Nantes -> very lively small city, the Jules Verne park in particular is quite something
Quiberon -> super iconic beach for them